#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
using namespace std;

void swap(int& a, int& b) {
    int t = a;
    a = b;
    b = t;
}

int main312() {
    int x = 5, y = 10;
    cout << "x = " << x << "    y = " << y << endl;
    swap(x, y);
    cout << "x = " << x << "    y = " << y << endl;
    return 0;
}
